Before proceeding to adduce the evidence of those persons who have witnessed phenomena which, if real, can only be attributed to preter-human intelligences, it will be well to take note of a series of curious observations on human beings, which prove that certain individuals are gifted with unusual powers of perception, sometimes by the ordinary senses leading to the discovery of new forces in nature, sometimes in a manner which no abnormal power of the ordinary senses will account for, but which imply the existence of faculties in the human mind of a nature analogous to those which are generally termed supernatural, and are attributed to the action of unembodied intelligences. It will be seen that we are thus naturally led up to higher phenomena, and are enabled, to some extent, to bridge over the great gulf between the so-called natural and supernatural.

I wish first to call my reader's attention to the researches of Baron Reichenbach, as detailed in Dr. Gregory's translation of his elaborate work. He observed that persons in a peculiar nervous condition experienced well-marked and definite sensations on contact with magnets and crystals, and in total darkness saw luminous emanations from them. He afterwards found that numbers of persons in perfect health and of superior intellect could perceive the same phenomena.